KR101448897B1 - Polypropylene-based light diffusion plate having anti static electricity for LED lighting - Google Patents

Abstract

The present invention relates to a polypropylene-based light diffusion plate having an anti static electricity function for LED lighting has a purpose to provide the polypropylene-based light diffusion plate capable of preventing external pollutant from being attached with static electricity on a PEDOT-based film layer coated on a surface and having the excellent transparency, the low deformation rate of light diffusion material with the heat of a LED light source after production, having a good processability with the low deformation rate in the formation, capable of reusing the plate after usage, and having lower production costs than the existing polypropylene-based light diffusion plate. The constitution of the polypropylene-based light diffusion plate for the LED lighting having the anti static electricity function comprises a polypropylene-based light diffusion resin plate in which a polypropylene-based light diffusion resin composition including a polypropylene-1 hexene copolymer and silica is shaped and a PEDOT-based film layer to control the occurrence of the anti electricity by being coated on the surface of a PEDOT-based conductive high-polymer composition including PEDOT, a polyurethane binder, isopropyl alcohol, a surfactant, and glycol solvent.

Description

[0001] The present invention relates to a polypropylene-based light diffusion plate having an anti-static function,

The present invention relates to a polypropylene light-diffusing plate for an LED illuminator having an antistatic function, and more particularly, to a polypropylene light-diffusing plate having an antistatic property, which can suppress the generation of static electricity on the surface of a polypropylene- To a polypropylene light diffusing plate having a film layer in which a PEDOT-based conductive polymer composition is thin-coated.

Recently, governments, municipalities, companies, and households have been making various efforts to reduce greenhouse gas emissions, which are causing global warming and abnormal weather phenomena. One of them is lighting.

In general, the filament lighting used for lighting has a high power consumption rate and high emission of carbon dioxide. In contrast, a fluorescent lamp having a low power consumption is also environmentally friendly because it is a light source using mercury.

For this reason, LED lighting that can be used environmentally and semi-permanently is getting popular recently because it is close to natural light and energy saving effect compared to conventional lighting fixtures, and does not use heavy metal stones.

The LED (light emitting diode) has a junction structure of P-type and N-type semiconductor, and when the voltage is applied, it is an optoelectronic device emitting light of energy corresponding to the band gap of the semiconductor by the combination of electrons and holes, Since the time is faster than general bulbs and the power consumption is as low as 20%, it has been utilized in many fields including high efficiency lighting devices in recent years.

More specifically, the LED for illumination uses a light emitting material that emits excitons, which are energy states of holes and electrons injected from both electrodes and emit light, and excitons are stable and emit light, and classified into organic LEDs and inorganic LEDs .

Organic LEDs are LEDs that use organic materials or polymers as luminescent materials. They are beautiful in color and can be used as points, lines, and planar light sources. However, at present, blue-based research is insufficient, production infrastructure is expensive, It has a short life span and is not suitable for lighting.

On the other hand, inorganic LED uses light emitting material as an inorganic substance, and it has a disadvantage that light is straight and generates heat. However, research has been conducted to use it as light because light is bright and production is easy and various colors can be expressed. Has been developed and developed. As shown in FIG. 5, using an inorganic LED, LEDs emitting white light can be implemented by combining RGB colors (a), or by emitting blue light or ultraviolet light to a fluorescent plate (b) or (c).

A floodlight using such a light emitting diode utilizes a module in which a plurality of high-brightness LEDs are assembled on a substrate as a light source, and is used as illumination means such as a signboard, a structure lighting, and a leg.

However, since such a high-brightness light emitting diode has a strong directivity and a high luminance, the brightness of illumination is reduced by using an appropriate light diffusion plate. The light diffusing plate is used to conceal the shape of the LED light source and to uniformly diffuse the light emitted from the light source.

FIG. 6 is a view illustrating an example of the operation and application of a general optical diffusion plate. The LED illumination uses a module in which a plurality of high-brightness LEDs are assembled on a substrate, and is used as a light source. Since a high-luminance light emitting diode has a strong directivity and a high luminance, it uses a proper light diffusing plate (sheet) to form a uniform illuminance to form a bright color and use it as illumination. The reason for this is that the light emitting diodes used in LED lighting come into the eyes as they are scattered light, and the pattern of the substrate looks like the upper figure. When using the light diffusion plate like this in the bottom view, So that the lighting can be obtained.

Recently, several studies have been conducted to improve the performance of the optical diffusion plate.

Among domestic companies, Cheil Industries is a maker of LCD computer backlight units. Light diffusers made by mixing light diffusing particles having a very small micron unit size on synthetic resin adhesives on one side or both sides of light diffusing plate for diffusing light are arranged at regular intervals The present invention further includes an embossing layer which is formed to cover the light diffusion layer and which is formed as an uneven surface to refract and reflect light .

Another domestic company, GEL KOREA, has a technique for producing a diffuser plate in which light emitted from a light source of an LED illumination device is scattered by bubbles having a predetermined size formed on the diffuser plate, The light is diffused uniformly over the entire surface of the substrate, and an excellent light transmittance is provided.

In addition, teijin, a foreign company, manufactures and sells LCD light diffusing plates due to the spread of notebook computers and space-saving desktop PCs and the large screen of liquid crystal displays, In order to exhibit its function with a wide viewing angle and a wide viewing angle, we have studied a product which satisfies the requirements of the function of directing the light ray transmittance, light diffusivity, Aiming at improving the adhesiveness with resin beads for imparting projections, it has high light diffusibility and has a light diffusing property and a total light transmittance superior to those of conventional products with the aim of realizing a film for a light diffusion sheet capable of increasing a viewing angle And has developed a resin having a small reflectance in the visible light region. In particular, a large number of projections are provided on the rear side of the light diffusing plate to prevent the sting phenomenon with the light guide plate, thereby suppressing luminance unevenness of the liquid crystal display.

Although various light diffusion techniques have been studied, the most widely used light diffusion plate material is a polycarbonate light diffusion plate. These polycarbonate materials are widely used because they are excellent in light transmittance, impact resistance and heat resistance.

However, polycarbonate-based optical diffusers are expensive and incapable of being recycled, and a large amount of CO ₂ is generated during the manufacturing process, causing greenhouse gases, which are the main cause of global warming, to cause environmental pollution. A substitute material for a light diffusion plate is required.

On the other hand, another problem that occurs in most optical diffusers including the polycarbonate-based optical diffusing plate is that it is susceptible to contamination due to the adherence of external contaminants due to static electricity generated on the surface of the optical diffusing plate However, even if the performance of the optical diffusion plate is improved, there is a problem that the degree of contamination increases with time and the optical diffusion performance is deteriorated.

Korean Patent Laid-Open Publication No. 10-2007-0108021 (November 8, 2007) Korean Patent Laid Open Publication No. 10-2009-0020704 (Feb. Korean Patent Laid-Open Publication No. 10-2005-0070289 (July 7, 2005) Korean Patent Registration No. 10-0518909 (2005.09.27.) Korean Patent Registration No. 10-0755010 (Aug. 28, 2007) Korean Utility Model Publication Disclosure Publication No. 20-2010-0007480 (2010.07.22.)

It is an object of the present invention to overcome the above-described problems and provide a method of manufacturing a light emitting diode, which is less expensive than conventional polycarbonate-based light diffusing plates and can be recycled after use, Provided is a polypropylene-based light diffusing plate capable of preventing sticking of external contaminants due to static electricity by the PEDOT film layer coated on the surface, which has less strain on the light diffusion plate material due to heat, There is.

Disclosure of Invention Technical Problem [8] In order to accomplish the above objects and to solve the conventional drawbacks of the present invention, a polypropylene-based light diffusing resin composition comprising a polypropylene-1-hexene copolymer and silica, A resin plate;

A PEDOT-based film layer formed by coating a surface of a polypropylene-based optical acid resin plate with a PEDOT-based conductive polymer composition composed of PEDOT, a polyurethane binder, isopropyl alcohol, a surfactant and a glycol solvent so as to suppress the generation of static electricity; And a polypropylene light diffusion plate for an LED illuminator having an antistatic function.

In a preferred embodiment of the present invention, the PEDOT conductive polymer composition comprises 59 to 70 wt% of PEDOT (poly 3-4 ethylene dioxythiophene), 12 to 15 wt% of polyurethane binder, 15 to 25 wt% of isopropyl alcohol, 0.1 to 0.3 wt%, and a glycol solvent of 1.5 to 2 wt%.

In a preferred embodiment, the PEDOT-based conductive polymer composition may be thin-coated on at least one side of the surface of the polypropylene light-diffusing resin plate after diluting with a 0.8 to 1.3% solution.

In a preferred embodiment, the thickness of the polypropylene light-diffusing resin plate is 1 to 5 mm, and the thickness of the PEDOT film layer is 0.09 to 0.1 mm.

In a preferred embodiment, the surfactant may be 4- (1,1,3,3-Tetramethylbutyl) phenyl-polyethylene glycol.

In a preferred embodiment, the glycol solvent may be ethylene glycol.

In a preferred embodiment, the polypropylene light-diffusing resin composition may be composed of 95 to 98 wt% of a polypropylene-1-hexene copolymer and 2 to 5 wt% of silica.

In a preferred embodiment, the polypropylene-1-hexene copolymer may be copolymerized with 90 to 95% of propylene (X) and 5 to 10 wt% of 1-hexene (Y) according to the following formula:

[Chemical Formula]

In a preferred embodiment, the polypropylene-1-hexene copolymer may have an average molecular weight of 25,000 to 30,000.

In a preferred embodiment, the polypropylene-1-hexene copolymer has a melting temperature (Tm) of 109.5 to 151.7 ° C and a crystallization temperature (Tc) of 109.5 to 116.8 ° C.

As described above, the polypropylene light diffusing plate having the antistatic function according to the present invention can be produced at a low cost because the cost of about 80% of the polycarbonate material used as the main material of the conventional light diffusing plate is cheap, , It can be applied to fields that are close to half of the total LED market, such as cell phones using LED, commercial lighting except BLU, residential lighting, road lighting, and automobile headlight,

Also, unlike polycarbonate, it can be recycled after use, and greenhouse gases are generated during production, which is environmentally friendly.

In addition, since the melting point and the recrystallization temperature are high, it is possible to replace the polycarbonate because the strain of the LED light source is low and the transparency is excellent and the optical linearity is better than that of the polycarbonate. Advantages,

In addition, the PEDOT conductive polymer composition is coated on the surface of the polypropylene light-diffusing resin plate to prevent the generation of static electricity, thereby preventing foreign matter such as dust from adhering, thereby saving maintenance cost and time of the LED lighting fixture It is an invention that is highly expected to be used in industry as an invention.

1 is a view illustrating an example of a polypropylene light diffuser according to an embodiment of the present invention,
Figure 2 is a molecular formula of a polypropylene-1-hexene copolymer according to one embodiment of the present invention,
3 is a view illustrating a biaxial extruder used for extrusion molding a polymer chip of a light diffusing resin composition according to an embodiment of the present invention,
FIG. 4 is a diagram illustrating the illuminance measurement conditions of the optical diffusing plate and the comparative optical diffusing plate of the present invention,
FIG. 5 is a view showing an embodiment of a white LED ((a) RGB color combination, (b) blue LED + phosphor, (C) ultraviolet LED +
6 is an exemplary view showing an action and application example of a general optical diffusion plate.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a view illustrating an example of a polypropylene light diffuser according to an embodiment of the present invention. As shown in the figure, the polypropylene light-diffusing plate comprises a polypropylene-based light-diffusing resin plate 1 and a PEDOT-based film layer (not shown) laminated on at least one side of the surface of the polypropylene- 2).

Wherein the resin composition constituting the polypropylene resin plate (1) is composed of 95 to 98 wt% of a polypropylene-1-hexene copolymer and 2 to 5 wt% of a silica, wherein the polypropylene- %, 1-hexene 5 to 10 wt%.

The reason for the above-mentioned composition is that the copolymerization of propylene and 1-hexene has good thermal stability and transparency that can be used for a light diffusion plate, and silica (SiO ₂ ) is used as a light diffusing agent in order to effectively cause light diffusion of the copolymer. Was added.

The polypropylene-1-hexene copolymer is composed of 90 to 95% of propylene (X) and 5 to 10 wt% of 1-hexene (Y) according to the formula shown in FIG.

The polypropylene-1-hexene copolymer is a copolymer of an average molecular weight of 25,000 to 30,000, which is obtained by polymerizing propylene as a monomer and 1 hexene. In the figure, X is the number of monomers injected in the propylene + 1-hexene copolymer so that propylene has a weight percentage of 90 to 95 wt%, Y is 5 to 10 wt% of 1-hexene, Is the number of monomers injected into the polymer.

The polymerization method of the polypropylene-1-hexene copolymer is basically a polypropylene or polyethylene polymerization process and a kind of suspension polymerization (slurry polymerization). Since the catalyst used in the polymerization is a coordination polymerization catalyst, there is no initiator, and alkylaluminum is used as a cocatalyst. Typically, Tri-ethyl Aluminum is used, an external electron donor is used as a promoter in polypropylene polymerization, CMDMS (Cyclo Methyl Di-Methyl Silane) was used. In accordance with an embodiment, 10 to 15 g of cocatalyst and 1 to 2 g of cocatalyst were used per 1 catalyst.

The propylene constituting the polypropylene-1-hexene copolymer is used to solve the problem that polycarbonate, which is a conventional light diffusing material, can not be recycled and generates a large amount of CO ₂ during the production process. It is lower in cost than polycarbonate and can be recycled And it is a material used to replace polycarbonate because it has a high melting point and a high recrystallization temperature in the production of a copolymer or a light diffusion plate and has a low strain due to an LED light source or other light source,

1-Hexene is a material used to improve the transparency of a light-diffusing resin for LED illumination. That is, since propylene alone has a low transparency, there is a problem in using it as a light diffusing plate. To solve this problem, 1-hexene is copolymerized with propylene.

The reason why the mixing ratio of 1-hexene in the polypropylene-1-hexene copolymer is limited is that when the content is less than 5 wt%, the thermosetting property is excellent but it is very opaque, , There is a disadvantage that the LED illumination can be seen, and the thermal stability is also very poor.

Thermal stability is related to thermal deformation by LED light when manufacturing optical diffusing plate. When it is weak against heat, it is easily deformed and durability is lost and product value is lost. Uneven transmission of LED light source due to deformation is not performed, Element.

Illustratively, propylene is 95% by weight and the melting temperature (Tm) is 158.7 占 폚 and the crystal temperature (Tc) is 116.8 占 폚 when 1 hexene is 5wt%. The melting temperature (Tm) is 109.5 deg. C, the melting temperature is higher than 150 deg. C, and the crystallization temperature is also higher than 109 deg. C and is at least 100 deg. C Is maintained in a solid state so that it can not be easily deformed even when it is exposed to the LED light source for a long time, resulting in a high product value. For reference, the melting temperature of polycarbonate used as a conventional light diffusing material is up to 140 캜. Therefore, it can be seen that the melting temperature of the present invention is much higher.

The reason why the mixing ratio between the polypropylene-1-hexene copolymer and the silica is limited is that when the amount is less than 2 wt%, the light diffusing property is deteriorated because the light intensity is too high. When the amount is more than 5 wt%, the lightness is too lower than that of the conventional polycarbonate This is because it degrades the performance of LED lighting.

That is, as the amount of silica added to the polypropylene-1-hexene copolymer increases, the light diffusion material improves the hiding power and diffusibility of the LED light source, but at the same time, the light transmittance (total light transmittance) As the number of LED light sources increases, yellowing may occur on the diffuser plate due to ultraviolet rays emitted from the light source. Also, if the temperature exceeds the above-described range, the thermal stability is deteriorated, and the manufacturing cost is too high, or the manufacturing cost is too high or too low.

Silica, which is the light diffusing agent, is a substance used for effectively causing light diffusion of a light diffusion resin. These silicas are mixed with the polypropylene 1-hexene copolymer powder in powder form. For silica, commercially available silica may be used.

On the other hand, the conductive polymer composition constituting the PEDOT (poly-3-4 ethylene dioxythiophene) film layer 2, which is thin-coated on at least one side of the surface of the polypropylene-based optical acid resin plate to suppress the generation of static electricity, 59 to 70 wt% of polyurethane resin, 15 to 25 wt% of polyurethane binder, 15 to 25 wt% of isopropyl alcohol, 0.1 to 0.3 wt% of surfactant and 1.5 to 2 wt% of glycol solvent do.

The PEDOT (poly-4-ethylenedioxythiophene) is a conductive polymer material and has a light-transmitting property, so it is a polymeric material that can have antistatic effect without lowering the light diffusion performance when used in a polypropylene-based light diffusion plate. The reason for limiting the mixing ratio is that when the amount is less than 59 wt%, the resistance is increased by 10 ⁷ or more, failing to achieve an antistatic effect. When the amount exceeds 70 wt%, the light transmittance is lowered as the PEDOT concentration is lowered, This is because it shows the disadvantage that it appears darker.

When the PEDOT-based film layer is coated on the polypropylene-based light-diffusing resin plate, the polyurethane binder improves the dispersibility of the PEDOT polymer and increases the adhesion to the substrate (polypropylene-based light diffusing plate resin) . The reason for limiting the mixing ratio is that when the content is less than 12 wt%, the adhesion between the polypropylene light-diffusing resin plate and the PEDOT film layer as the conductive polymer film layer is decreased, and the dispersion of the PEDOT is low, And if it exceeds 15 wt%, the dispersion is good, but the conductivity is deteriorated by disturbing the interaction between the conductive polymer PEDOT polymer.

The isopropyl alcohol is used to apply a polyurethane binder. The reason for limiting the mixing ratio is that when the content is less than 15 wt%, the dispersibility and the adhesion to the substrate are decreased. When the content exceeds 25 wt%, the surface resistance of the polyurethane binder is increased.

As the surfactant, 4- (1,1,3,3-Tetramethylbutyl) phenyl-polyethylene glycol solution / (trade name: Triton X 100) is used. These surfactants are used to improve the solution stability and uniform dispersibility of the coating composition forming the PEDOT film layer. The reason for limiting the mixing ratio is that when the content is less than 0.1 wt%, the PEDOT conductive polymer and the ethylene glycol (PEDOT) film layer (2) is formed when the dispersibility of the PEDOT polymer is reduced due to the reduced dispersibility between the Cole and the isopropyl alcohol, and when it exceeds 0.3 wt% This results in less physical properties than the optimum physical properties.

The glycol solvent is a high boiling point solvent having a boiling point of 197 ° C. In the present invention, ethylene glycol is used. When the content of the glycol solvent is less than 1.5 wt%, the resistance increases and the conductivity decreases. When the content of the glycol solvent exceeds 2 wt%, the conductivity of the conductive polymer increases. Which prevents movement and reduces conductivity.

Hereinafter, a method for manufacturing a polypropylene light diffusing plate according to an embodiment of the present invention will be described by forming a polypropylene light diffusion resin plate and a PEDOT film layer.

First, a method of manufacturing a light-diffusing resin plate in which the polypropylene-1-hexene copolymer and silica are mixed will be described.

The light diffusing resin plate is generally formed by extrusion molding or injection molding of a polymerized polypropylene-1-hexene copolymer. Preferably, the use of the injection molding method is excellent in the dimensional accuracy of the light-diffusing resin plate as a molded product and the productivity is high, so that it is possible to reduce the cost of the external mold processing.

The thickness of the polypropylene-based light-diffusing resin plate according to one embodiment of extrusion or injection molding is preferably in the range of 1 to 5 mm. If the thickness is less than 1 mm, the strength of the LED light is too strong to lower the light diffusing ability, and the strength of the light diffusion resin plate may be weakened and durability may deteriorate. If the thickness is 5 mm or more, This is because it is difficult to obtain high brightness of the LED light source.

The shape of the light-diffusing resin plate can be formed into various shapes including a plate-like, tubular or dome-like shape as required.

The polymerization method of the polypropylene-1-hexene copolymer is basically a polypropylene or polyethylene polymerization process and a kind of suspension polymerization (slurry polymerization). Since the catalyst used in the polymerization is a coordination polymerization catalyst, there is no initiator, and alkylaluminum is used as a cocatalyst. Typically, Tri-ethyl Aluminum is used, an external electron donor is used as a promoter in polypropylene polymerization, CMDMS (Cyclo Methyl Di-Methyl Silane) was used. In accordance with an embodiment, 10 to 15 g of cocatalyst and 1 to 2 g of cocatalyst were used per 1 catalyst.

When a polypropylene light-diffusing resin plate having a thickness of 1 to 5 mm as described above is prepared, the PEDOT-based conductive polymer composition prepared according to the present invention is diluted with a 0.3 to 1.3% solution, and then a polypropylene- To form a PEDOT-based film layer which is a transparent film having a thin thickness (0.09 to 0.1 mm).

When a PEDOT film layer is formed, an environmentally friendly light diffusion plate which can be recycled and has a small greenhouse gas emission is manufactured with an inexpensive production cost that increases stain resistance by suppressing the generation of static electricity.

When the polypropylene light diffusing plate having the anti-static function according to the present invention is prepared as described above, it may be applied to an LED lamp. In this case, the LED lamp can be applied to all LED lamps such as a ceiling lamp or a wall lamp.

That is, an LED light source (lamp) is installed in a lighting device frame designed for a producer's purpose, and a polypropylene light diffusion plate according to the present invention is installed at a spot spaced apart from the light source. Such an LED lighting apparatus can replace a polycarbonate because it has less strain on a light diffusion plate material due to the heat of an LED light source and is superior in transparency and has a better optical straightness than a polycarbonate. Further, it prevents static electricity, So that the LED light source can provide brightness that does not differ from that of the first installation even after a lapse of time, thereby reducing the maintenance cost and time of the LED lighting fixture.

The following is a preferred embodiment of the present invention.

(Example 1) - Propylene + 1-Hexene Copolymer (PP1H)

Polymerization was carried out by feeding two monomers into the reactor under the condition that they could be polymerized in a proportion of 95 wt% of propylene and 5 wt% of 1-hexene by copolymerization, and then polymerizing to obtain a copolymer having a Hexene content of 5 wt% . The polymerized molecular form is shown in Fig.

The melting temperature (Tm) of copolymerized propylene 95wt% + 1-hexene (PP1H-1) was 158.7 ° C and the crystallization temperature (Tc) was 116.8 ° C.

Example 2 Propylene 90 wt% + 1-hexene 10 wt% (PP1H-2)

The polymerization was carried out by feeding two monomers into the reactor in such a manner that they could be polymerized in a proportion of 90 wt% of propylene and 10 wt% of 1-hexene by copolymerization, and then polymerized to prepare a copolymer of 10 wt% of Hexene in a polypropylene resin . The polymerized molecular form is shown in Fig.

The melt temperature (Tm) of the copolymerized propylene 90wt% + 1-hexene 10wt% (hereinafter referred to as 'PP1H-2') was 151.7 ° C and the crystallization temperature (Tc) was measured at 109.5 ° C.

(Example 3) Thermal stability and transparency

After the synthesis of Propylene + 1-Hexene Copolymer in the same manner as in Examples 1 and 2, thermal stability and transparency were measured.

Thermal stability (1 very unstable ~ 5 very stable) Transparency (1 very transparent ~ 5 very opaque)

As shown in Table 1, when the content of 1-hexene is less than 5 wt%, the thermal stability is excellent, but it is very opaque so that the roughness is not good. When the content is more than 10 wt% And the thermal stability was also very poor.

(Example 4) Measurement of illuminance

Propylene + 1-Hexene Copolymer was synthesized in the same manner as in Examples 1 and 2, and polymer chips were prepared by physical mixing with heat in an extruder using silica as a light diffusing agent. The polymer manufacturing chip is manufactured using a twin-screw extruder as shown in Fig. The Twin Screw Extruder shown was 20A for BAUTEK and 40 for L / D. It usually proceeds at about 200 ° C, but it is prepared by mixing (blending) at 230 ° C to increase the diffusibility.

Then, the light intensity was measured by selecting Propylene 95wt% + 1-Hexene 5wt% (PP1H 5wt%) and Propylene 90wt% + 1-Hexene 10wt% (PP1H 10wt%). As a comparative example, polycarbonate used as a conventional light diffusing material, pure polypropylene not containing silica (light diffusing agent), and silica content deviating from the numerical conditions of the present invention were also measured.

4 is a graph showing the illuminance measurement conditions of the light diffusing resin plate and the comparative light diffusing plate of the present invention used in Example 4. In FIG. 4, the measurement was conducted under the conditions of A = 35 mm B = 460 mm diameter 50 mm and LED 200 lx. In the figure, A is the LED light source, B is the illuminance sensor, and the diameter is the diameter of the center through hole of the plate on which the middle light diffusion resin plate is mounted.

The polycarbonate used as a comparative example is a new type of thermoplastic resin synthesized from [O-R-O-CO] n type polymer as a raw material with a dioxy compound and aryl carbonate. Polycarbonate has attracted attention because it has excellent heat resistance and resistance to aging, and is extremely strong against impact and substitutes for metal. Especially, it is very strong at high temperature and low temperature, and it has excellent heat stability and can withstand up to 140 ℃. It also has low temperature strength and does not change its strength even under -100 ℃ and has excellent weather resistance. Transparency is glossy, molding shrinkage is small, and there is little change with time during long-term use.

However, since the cost of the material is high and it is impossible to recycle it, there is a disadvantage that it is replaced with the polypropylene light-diffusing resin composition of the present invention.

As a result of the experiment, the light-diffusing resin composition according to the present invention comprising a polypropylene-1-hexene copolymer and an optical additive has a Tm value of 160 to 161 ° C higher than 151.7 ° C to 158.7 ° C, which is the Tm of the polypropylene-1-hexene copolymer, It was found that it is better than PC.

In addition, a copolymer with 1-hexene was formed for transparency of polypropylene. The silica was blended according to the contents as shown in Tables 2 and 3 in order to utilize it as a light diffusion plate for LED illumination. As a result, PP1H-2, silica 2 wt% Showed the best roughness, but showed a little lower thermal stability than PP1H-1. Here, up to 5 wt% of the numerical limit section of the present invention exhibited better illuminance than polycarbonate.

In addition, PP1H-1 and silica showed good roughness at 2%, thermal stability was superior to PP1H-2, and up to 5 wt% of the numerical limit range of the present invention was better than polycarbonate.

From this, it can be seen that the light-diffusing resin plate of the present invention has a transparency which can be used as a light diffusing plate for illumination in comparison with the conventional polycarbonate light diffusing plate.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings, in which various embodiments of the optical diffusing plate of the present invention are shown, wherein the polypropylene light-diffusing resin plate is coated with a PEDOT conductive polymer composition. In the following Examples, a conventional PC (polycarbonate) optical diffusing plate was used as a comparative example, and the PEDOT-based conductive polymer composition, which is a conductive polymer composition, was applied to the light- Prevention effect can be known. The experimental data are as follows. 1% diluted solution was prepared from the PEDOT polymer composition, and a transparent thin film was formed on the light diffusion resin plate by bar coating. The following data were measured.

(Example 5)

In Table 4, PP is a general PC (polycarbonate) light diffusing plate used as a comparative example, and 2% of PP is 2% of the silica disclosed in Table 2 of Example 4 among the polypropylene-based light- PEDOT (1%) -based composition as a conductive polymer composition was applied to a light-diffusing resin plate of 60 wt% PEDOT. Example 1 using a light diffusion plate coated with 13 wt% of polyurethane binder, 1.9 wt% of ethylene glycol, 25 wt% of isopropyl alcohol, and 0.1 wt% of 4- (1,1,3,3-tetramethylbutyl) phenyl- to be.

In addition, the PP 5% is a PEDOT (1%) composition prepared as described above, which is a conductive polymer composition, on the light diffusing resin plate at 5% of the silica disclosed in Table 2 of Example 4 among the polypropylene- This is an embodiment using a bar-coated optical diffusion plate.

The PC and PP in Table 4 are basically nonconductive. However, when the diluted solution of the PEDOT (1%) conductive polymer composition according to the present invention was coated thereon, the resistance value was lowered. It can be seen from this result that an antistatic effect can be exhibited.

(Example 6)

As shown in Table 5, it can be seen that when the PEDOT (1%) composition as a conductive polymer composition is coated on the light diffusion resin plate, the change of the light transmittance is small, and the decrease in the physical properties of the light diffusion resin plate is small .

(Example 7)

As shown in Table 6, it can be seen that there is almost no difference between before and after coating in the case of cloudiness, and it can be seen that it has very good transparency.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Claims (10)

A polypropylene light-diffusing resin plate formed by molding a polypropylene light-diffusing resin composition composed of a polypropylene-1-hexene copolymer and silica;
A PEDOT-based film layer formed by coating a surface of a polypropylene-based optical acid resin plate with a PEDOT-based conductive polymer composition composed of PEDOT, a polyurethane binder, isopropyl alcohol, a surfactant and a glycol solvent so as to suppress the generation of static electricity; However,
Wherein the PEDOT conductive polymer composition comprises 59 to 70 wt% of PEDOT (poly 3-4 ethylene dioxythiophene), 12 to 15 wt% of a polyurethane binder, 15 to 25 wt% of isopropyl alcohol, 0.1 to 0.3 wt% of a surfactant, And 1.5 to 2 wt% of a co-solvent. The polypropylene light diffusing plate for an LED illuminator having an antistatic function.
delete The method according to claim 1,
Characterized in that the PEDOT-based conductive polymer composition is thin-coated on at least one side of the surface of the polypropylene-based light-diffusing resin plate after being diluted with a 0.8 to 1.3% solution. The polypropylene-based light diffusion plate.
The method according to claim 1,
Characterized in that the thickness of the polypropylene light-diffusing resin plate is 1 to 5 mm, and the thickness of the PEDOT film layer is 0.09 to 0.1 mm. The polypropylene light diffusing plate for an LED illuminator having antistatic function .
The method according to claim 1,
Wherein the surfactant is 4- (1,1,3,3-tetramethylbutyl) phenyl-polyethylene glycol. The polypropylene light diffusing plate for an LED illuminator having an antistatic function.
The method according to claim 1,
Characterized in that ethylene glycol is used as the glycol solvent. The polypropylene light diffusing plate for an LED illuminator having an antistatic function.
The method according to claim 1,
Wherein the polypropylene-based light-diffusing resin composition is composed of 95 to 98 wt% of a polypropylene-1-hexene copolymer and 2 to 5 wt% of silica, and the polypropylene-based light diffusing resin composition has an antistatic function.
The method of claim 7,
The polypropylene-1-hexene copolymer is copolymerized with 90 to 95% of propylene (X) and 5 to 10 wt% of 1-hexene (Y) according to the following formula: Propylene light diffuser plate.
[Chemical Formula]

The method of claim 7,
Wherein the polypropylene-1-hexene copolymer has an average molecular weight of 25,000 to 30,000. The polypropylene-based light diffusing plate for an LED illuminator having an antistatic function.
The method of claim 7,
Wherein the polypropylene-1-hexene copolymer has a melting temperature (Tm) of 109.5 to 151.7 占 폚 and a crystal temperature (Tc) of 109.5 to 116.8 占 폚.

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